It’s from the etymology nomenclature from the avarian school of thought. Because so many birds were called “Yellow Bellied Sap Suckers”, it was decided by the “Birdos” that an appropriate Latin name should be given to the last bird in a flock (or gaggle, or parliament or murder). The name originally given was Charlieus Incredibilius Extremeius – named by Lady Dorthe (always lagging behind) Kroghinberger– a noted Danish “Birdo” in the 18th century who was infamous for always being the last person to arrive. This was ultimately shortened to Charlie. Hence the last person (or thing) to arrive is now called Charlie.

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Originally Posted by GSDane

Thanks for the explanations... much appreciated.
GSDane

Well, well, well... GOP, thank you again for a very detailed explanation on a very interesting subject.
Isn't it just amazing how much stuff old people know...